For anyone considering the XSi, perhaps this photo will be of interest. I was pleasantly surprised to see this kind of sharpness coming from a kit lens handheld in low light (and at its softest focal length, no less). Check out the detail on the nose at full resolution. 55mm f/5.6 1/8 ISO 800 NR: off ^^Click to see the full sized version. Not bad for a $100 lens!